Rendering Large Lists in React: Virtualization vs Infinite Scroll

When building React applications, rendering long lists can slow down your app or crash the browser. The packages react-window, react-virtualized, react-tiny-virtual-list, and react-infinite-scroll-component solve this problem in different ways. The key difference lies in how they handle DOM nodes: virtualization recycles nodes, while infinite scroll keeps appending them. Let's compare how they work in real engineering scenarios.

🏗️ Core Rendering Logic: Recycling vs Appending

react-window renders only the items visible in the viewport. It creates a fixed container and moves items within it as you scroll.

import { FixedSizeList } from 'react-window';

const List = ({ items }) => (
  <FixedSizeList height={500} itemCount={items.length} itemSize={35} width={300}>
    {({ index, style }) => (
      <div style={style}>
        {items[index]}
      </div>
    )}
  </FixedSizeList>
);

react-virtualized works similarly but uses a slightly older API structure with explicit row renderers.

import { List } from 'react-virtualized';

const List = ({ items }) => (
  <List
    height={500}
    rowCount={items.length}
    rowHeight={35}
    width={300}
    rowRenderer={({ index, key, style }) => (
      <div key={key} style={style}>
        {items[index]}
      </div>
    )}
  />
);

react-tiny-virtual-list provides a similar virtualization experience with a simpler prop structure focused on rendering items.

import VirtualList from 'react-tiny-virtual-list';

const List = ({ items }) => (
  <VirtualList
    width={300}
    height={500}
    itemCount={items.length}
    itemSize={35}
    renderItem={({ index }) => (
      <div key={index}>
        {items[index]}
      </div>
    )}
  />
);

react-infinite-scroll-component does not virtualize. It renders all children and appends more as you reach the bottom. This means DOM nodes accumulate over time.

import InfiniteScroll from 'react-infinite-scroll-component';

const List = ({ items, fetchMore }) => (
  <InfiniteScroll
    dataLength={items.length}
    next={fetchMore}
    hasMore={true}
    loader={<h4>Loading...</h4>}
    height={500}
  >
    {items.map((item, index) => (
      <div key={index}>{item}</div>
    ))}
  </InfiniteScroll>
);

📏 Handling Container Dimensions

Managing the width and height of the list container is critical for virtualization to calculate visible items correctly.

react-window includes a separate AutoSizer component to fill the parent container automatically.

import { FixedSizeList } from 'react-window';
import AutoSizer from 'react-virtualized-auto-sizer';

const List = ({ items }) => (
  <AutoSizer>
    {({ height, width }) => (
      <FixedSizeList height={height} width={width} itemCount={items.length} itemSize={35}>
        {({ index, style }) => <div style={style}>{items[index]}</div>}
      </FixedSizeList>
    )}
  </AutoSizer>
);

react-virtualized also uses AutoSizer but integrates it tightly within its own ecosystem.

import { List, AutoSizer } from 'react-virtualized';

const List = ({ items }) => (
  <AutoSizer>
    {({ height, width }) => (
      <List
        height={height}
        width={width}
        rowCount={items.length}
        rowHeight={35}
        rowRenderer={({ index, key, style }) => <div key={key} style={style}>{items[index]}</div>}
      />
    )}
  </AutoSizer>
);

react-tiny-virtual-list typically requires manual width and height props or CSS styling on the wrapper element.

import VirtualList from 'react-tiny-virtual-list';

const List = ({ items }) => (
  <div style={{ width: '100%', height: '500px' }}>
    <VirtualList
      width={300}
      height={500}
      itemCount={items.length}
      itemSize={35}
      renderItem={({ index }) => <div key={index}>{items[index]}</div>}
    />
  </div>
);

react-infinite-scroll-component relies on CSS or explicit height props to define the scrollable area.

import InfiniteScroll from 'react-infinite-scroll-component';

const List = ({ items, fetchMore }) => (
  <div style={{ height: '500px', overflow: 'auto' }}>
    <InfiniteScroll
      dataLength={items.length}
      next={fetchMore}
      hasMore={true}
      loader={<h4>Loading...</h4>}
      height={500}
    >
      {items.map((item, index) => <div key={index}>{item}</div>)}
    </InfiniteScroll>
  </div>
);

🔄 Loading More Data Patterns

Fetching additional data as the user scrolls is a common requirement. The implementation differs between virtualizers and infinite scroll wrappers.

react-window does not handle data fetching internally. You must track the scroll index and trigger fetches manually.

import { FixedSizeList } from 'react-window';

const List = ({ items, fetchMore }) => {
  const onItemsRendered = ({ visibleStopIndex }) => {
    if (visibleStopIndex >= items.length - 5) fetchMore();
  };

  return (
    <FixedSizeList height={500} itemCount={items.length} itemSize={35} width={300} onItemsRendered={onItemsRendered}>
      {({ index, style }) => <div style={style}>{items[index]}</div>}
    </FixedSizeList>
  );
};

react-virtualized uses a similar manual approach with the onRowsRendered callback.

import { List } from 'react-virtualized';

const List = ({ items, fetchMore }) => (
  <List
    height={500}
    rowCount={items.length}
    rowHeight={35}
    width={300}
    onRowsRendered={({ stopIndex }) => {
      if (stopIndex >= items.length - 5) fetchMore();
    }}
    rowRenderer={({ index, key, style }) => <div key={key} style={style}>{items[index]}</div>}
  />
);

react-tiny-virtual-list requires you to implement logic outside the component to check scroll position or rendered indices.

import VirtualList from 'react-tiny-virtual-list';

const List = ({ items, fetchMore }) => (
  <VirtualList
    width={300}
    height={500}
    itemCount={items.length}
    itemSize={35}
    renderItem={({ index }) => <div key={index}>{items[index]}</div>}
    // You must wrap this or use refs to track scroll for fetchMore
  />
);

react-infinite-scroll-component has data loading built-in via the next prop, making it the easiest to set up for simple feeds.

import InfiniteScroll from 'react-infinite-scroll-component';

const List = ({ items, fetchMore }) => (
  <InfiniteScroll
    dataLength={items.length}
    next={fetchMore}
    hasMore={true}
    loader={<h4>Loading...</h4>}
    height={500}
  >
    {items.map((item, index) => <div key={index}>{item}</div>)}
  </InfiniteScroll>
);

⚠️ Maintenance and Longevity

Choosing a library involves considering its future support. Some packages are no longer actively developed.

react-window is actively maintained by Brian Vaughn at Vercel. It is the recommended path for virtualization in the React ecosystem.

// react-window is the current standard
import { FixedSizeList } from 'react-window';

react-virtualized is in maintenance mode. The author recommends migrating to react-window. Do not use it for new projects.

// react-virtualized is legacy
// Only use for existing projects
import { List } from 'react-virtualized';

react-tiny-virtual-list has less frequent updates but remains functional for simple use cases. Check the repository for recent activity before committing.

// react-tiny-virtual-list is stable but less active
import VirtualList from 'react-tiny-virtual-list';

react-infinite-scroll-component is widely used and maintained. It solves a different problem (appending vs virtualizing), so it remains relevant for specific UI patterns.

// react-infinite-scroll-component is active
import InfiniteScroll from 'react-infinite-scroll-component';

📊 Summary Table

💡 Final Recommendation

react-window is the best choice for most modern applications requiring virtualization. It balances performance with a maintainable codebase and active support.

react-infinite-scroll-component is perfect for social feeds or comment sections where simplicity matters more than handling tens of thousands of items.

react-virtualized should be avoided in new work. If you inherit a project using it, plan to migrate to react-window when possible.

react-tiny-virtual-list is a viable alternative if you need virtualization but find react-window too heavy or complex for your specific needs.